JPH07312564A - Tuner device - Google Patents

Abstract

PURPOSE:To obtain the tuner device in which a set equipment 9 is made small by forming a mother board 1 small and decreasing total number of band changeover terminals 5, 6. CONSTITUTION:The tuner device is made up of a tuner 3 receiving a signal for plural reception frequency bands and a band decoder 4 selecting a reception frequency band received by the tuner 3 based on a 2-bit parallel signal to be received, the band decoder 4 is integrated in the tuner 3 and 1st and 2nd band changeover terminals 5, 6 are provided to the tuner 3. Only a microcomputer 2 to select any reception frequency band is mounted on the mother board 1 and an output terminal of the microcomputer 2 and 1st and 2nd band changeover terminals 5, 6 are interconnected by 1st and 2nd data lines.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tuner device, and more particularly to a tuner device having a tuner capable of receiving signals in a plurality of reception frequency bands and a band decoder for switching the reception frequency bands to be received.

[0002]

2. Description of the Related Art Conventionally, a tuner device of a voltage synthesizer (V / S) system or a frequency synthesizer (F / S) is used.
S) type tuner devices, for example, TV (television) tuners for receiving CATV (cable television broadcasting), UHF, CATV SUPPE
It has four receivable reception frequency bands of R, VHF high band (H), and CATV MID to VHF low band (L). And on the TV tuner side,
Four band switching terminals respectively corresponding to four reception frequency bands are derived, and the operating voltage (B +) of the TV tuner, for example, 12V is supplied from the band decoder to one of these four band switching terminals. , The reception frequency band is selected (switched). In this case, the band decoder is mounted on the motherboard arranged in the TV set device together with the microcomputer for controlling the band decoder, and the four band switching terminals and the four outputs of the band decoder are connected. Is performed by four connection lines (connection patterns) provided between the TV tuner and the motherboard.

FIG. 3 shows such a known tuner device,
For example, it is a schematic configuration diagram showing a layout connection relationship between a TV tuner and a motherboard in a TV set device.

In FIG. 3, reference numeral 21 denotes a mother board, 22
Is a microcomputer, 23 is a band decoder, 24 is a TV tuner, 25 is a first band switching terminal, 26 is a second band switching terminal, 27 is a third band switching terminal, and 28 is a fourth band switching terminal. The terminal 29 is a TV set device.

A microcomputer 22 and a band decoder 23 are mounted on the mother board 21, and the TV tuner 24 has a first band switching terminal 25, a second band switching terminal 26, and a third band switching terminal 26. A terminal 27 and a fourth band switching terminal 28 are provided. The mother board 21 and the TV tuner 24 are incorporated in the TV set device 29, and the band decoder 23 on the mother board 21.
Between the four outputs and the first band switching terminal 25, the second band switching terminal 26, the third band switching terminal 27, and the fourth band switching terminal 28 on the TV tuner 24 side. Are individually connected with four connection lines (connection patterns). Further, on the mother board 21, the microcomputer 22 and the band decoder 23 are provided with two lines (pattern) of a data line (pattern) and a clock line (pattern).
Are joined by. In this case, the microcomputer 22 sends the band switching serial data signal to the data line (pattern) and sends the clock signal to the clock line (pattern).

In the above structure, when the TV listener operates the microcomputer 22 to switch the reception frequency band of the TV tuner 24, a serial data signal for band switching is sent to the data line (pattern) in response to the operation. Also, clock signals are sent out to the clock lines (patterns) and input to the band decoder 23. At this time, the band decoder 23 decodes the input band switching serial data signal at the timing of the input clock signal and outputs the desired one of the four outputs to the operating voltage of the TV tuner. Equal receive frequency band switching signals are derived. The reception frequency band switching signal is supplied to the TV tuner 24 via the corresponding band switching terminal, for example, the first band switching terminal 25, and the reception frequency band is selected (switched) by the TV tuner 24. Is what is done.

[0007]

In such a known tuner device, the microcomputer 22 is mounted on the motherboard 21.
And the band decoder 23 are mounted, the four outputs of the band decoder 23 and the first band switching terminal 25, the second band switching terminal 26, and the third band switching terminal 26 provided on the TV tuner 24 side are provided. Arrangement of four individual connection lines (connection patterns) for connecting the band switching terminal 27 and the fourth band switching terminal 28, and a data line for connecting the microcomputer 22 and the band decoder 23. Since the (pattern) and the clock line (pattern) are arranged, the pattern shape on the motherboard 21 is complicated, and the size of the motherboard 21 is inevitably large. There is a problem that the device cannot be downsized.

In the known tuner device, T
On the V tuner 24 side, a number of band switching terminals equal to the total number of reception frequency bands, for example, a first band switching terminal 25, a second band switching terminal 26, a third band switching terminal 27, and a fourth band switching terminal 27, Since it is necessary to provide each of the band switching terminals 28, the TV tuner 24 cannot be downsized due to the proper arrangement of the band switching terminals 25 to 28. There is also a problem that can not be downsized.

The present invention eliminates the above-mentioned problems, and it is an object of the present invention to make a motherboard small, reduce the total number of band switching terminals, and make a set device compact. It is to provide a tuner device.

[0010]

In order to achieve the above object, the present invention provides a tuner capable of receiving signals in a plurality of reception frequency bands, and the tuner receives the signals based on an input 2-bit parallel signal. The tuner comprises a band decoder for switching the reception frequency band, and means for integrally configuring the band decoder in the tuner.

[0011]

According to the above means, since the band decoder is integrally formed in the tuner, only the microcomputer needs to be mounted on the motherboard. Therefore, on the motherboard,
It is not necessary to provide a place for mounting a band decoder, but it is also necessary to provide a place for arranging a plurality of individual connection lines (connection patterns) for connecting each output of the band decoder and each band switching terminal provided on the tuner side. And since the pattern shape on the motherboard is extremely simplified,
The mother board can be configured in a small size, and the set device can be downsized accordingly.

Further, according to the above means, since the band decoder is integrally formed in the tuner, the band switching terminals provided in the tuner are also connected to the two lines connected between the outputs of the microcomputer on the motherboard. It suffices to provide the corresponding first and second band switching terminals. Therefore, there are less restrictions when properly arranging the band switching terminals on the tuner, and it is possible to configure the tuner in a small size, and accordingly, it is possible to achieve miniaturization of the set device, The degree of freedom in constructing the tuner can be increased.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a tuner device according to the present invention, and shows an example of a TV tuner having four reception frequency bands as the tuner device.

In FIG. 1, 1 is a motherboard, 2 is a microcomputer, 3 is a TV tuner, 4 is a band decoder, 5 is a first band switching terminal, 6 is a second band switching terminal, and 7 is a first band switching terminal. A data line, 8 is a second data line, and 9 is a TV set device.

The microcomputer 2 is mounted on the mother board 1.
Is mounted, and two lines of the first data line 7 and the second data line 8 are derived from the microcomputer 2. The band decoder 4 is integrally formed in the TV tuner 3, and the TV tuner 3 is provided with a first band switching terminal 5 and a second band switching terminal 6. The motherboard 1 and the TV tuner 3 are incorporated in the TV set device 9, and the first data line 7 and the second data line 8 derived from the microcomputer 2 on the motherboard 1 are
The first band switching terminal 5 on the TV tuner 3 side
And the second band switching terminal 6. further,
The four connection lines derived from the band decoder 4 are configured to be directly coupled to the reception frequency band switching unit of the TV tuner 3.

Next, FIG. 2 selects the logic states of the first data signal and the second data signal bit supplied from the microcomputer 2 to the first data line 7 and the second data line 8, respectively. It is an explanatory view showing an example of a relation with a (switchable) reception frequency band.

In FIG. 2, B1 is a UHF band and B2 is
Indicates a CATV SUPPER band, B3 indicates a VHF high band, and B4 indicates a CATV MID to VHF low band.

The operation of this embodiment will now be described with reference to FIGS.
Will be explained.

Now, when the TV listener operates the microcomputer 2 in order to switch the reception frequency band of the TV tuner 3, a 1-bit first data signal is sent to the first data line 7 in response to the operation. In addition, a second 1-bit data signal is also sent to the second data line 8 to conveniently generate a parallel 2-bit data signal. In this case, the logic states of the parallel 2-bit first and second data signal bits transmitted from the microcomputer 2 are as follows: UHF band B1 on the TV tuner 3 side as shown in FIG.
The first data signal bit is a logical 1
Then, the second data signal bit also becomes a logic 1 and T
When the CATV SUPPER band B2 is selected on the V tuner 3 side, the first data signal bit is a logic 1 and the second data signal bit is a logic 0. Further, the VHF high band B3 is set on the TV tuner 3 side. When selecting, the first data signal bit is a logic 0,
The second data signal bit becomes a logic 1 and finally the TV
When selecting CATVMID to VHF low band B4 on the tuner 3 side, the first data signal bit is a logical 0 and the second data signal bit is also a logical 0.

The first data signal is supplied to the band decoder 4 via the first first band switching terminal 5 connected to the first data line 7, and at the same time, the second data signal is also supplied. It is supplied to the band decoder 4 via the second band switching terminal 6 connected to the second data line 8. The band decoder 4 decodes the supplied first and second data signals, and outputs only one of the four outputs, for example, according to the logic state of the first and second data signal bits. A reception frequency band switching voltage of 12V is generated, and 0V is generated at the remaining output. That is, UH
When selecting the F band B1, the band decoder 4 of FIG.
The receiving frequency band switching voltage of 12V is generated only on the uppermost one of the four connecting lines derived from the receiving frequency band switching unit of the TV tuner 3 by the CATV SUP.
When the PER band B2 is selected, the reception frequency band switching voltage of 12V is generated only in the second line from the top. Further, when the VHF high band B3 is selected, a reception frequency band switching voltage of 12 V is generated only on the third line from the top, and when the CATV MID to VHF low band B4 is selected, the reception frequency band switching voltage of 12 V is generated only on the lowest line. Generates a reception frequency band switching voltage.

Then, when the reception frequency band switching voltage is supplied to the reception frequency band switching section via any of the lines, the TV tuner 3 selects (switches) the reception frequency band in the same manner as the known TV tuner. ) Is done, TV
The tuner 3 can receive the signal in the selected reception frequency band.

As described above, according to the present embodiment, since the band decoder 4 is integrally formed in the TV tuner 3, the arrangement on the motherboard 1 side is remarkably simplified, and the size of the mother board 1 is known. It is possible to make the size of the TV set much smaller than that of the TV set device.

Further, according to the present embodiment, the TV tuner 3
Since only the first and second band switching terminals 5 and 6 are provided in the above, it is possible to make the configuration smaller than a known tuner having a plurality of band switching terminals. Therefore, the TV set device can be downsized.

In the above embodiment, a TV tuner having four reception frequency bands has been described as an example of the tuner device, but the present invention is not limited to the TV tuner, and the same applies to tuners of other models. In addition, the total number of reception frequency bands is not limited to four, and may be three.

[0026]

As described above, according to the present invention,
The band decoder 4 is integrally configured in the tuner 3,
Since only the microcomputer 2 is mounted on the motherboard 1, it is not necessary to provide the mounting portion of the band decoder 4 on the motherboard 1, and each output of the band decoder 4 and each band switching terminal provided on the tuner side. The pattern shape on the motherboard 1 is extremely simplified, because it is not necessary to provide a location for disposing a plurality of individual connection lines (connection patterns) for coupling with each other. Therefore, the motherboard 1
As a result, the TV set device 9 can be downsized, and the TV set device 9 can be downsized accordingly.

Further, according to the present invention, the band decoder 4 is integrally formed in the tuner 3, and the number of band switching terminals provided in the tuner 3 is also connected to the output of the microcomputer 2 on the motherboard 1. It is sufficient to provide the first and second band switching terminals 5 and 6 corresponding to the two data lines. Therefore, many restrictions for properly arranging the band switching terminals 5 and 6 on the tuner 3 are eliminated, and the tuner 3 can be made compact, and the TV set device 9 can be miniaturized accordingly. Can be achieved, and the degree of freedom in configuring the tuner 3 can be increased.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a tuner device according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a relationship between a logic state of a data signal bit supplied from a microcomputer and a selected reception frequency band.

FIG. 3 is a block diagram showing an example of a known tuner device.

[Explanation of symbols]

 1 Motherboard 2 Microcomputer 3 TV Tuner 4 Band Decoder 5 First Band Switching Terminal 6 Second Band Switching Terminal 7 First Data Line 8 Second Data Line 9 TV Set Equipment

Claims (2)

[Claims] 1. A tuner capable of receiving signals in a plurality of reception frequency bands, and a band decoder for switching reception frequency bands to be received by the tuner on the basis of an input 2-bit parallel signal. A tuner device having a band decoder integrally configured. 2. The tuner device according to claim 1, wherein the tuner includes two input terminals to which a 2-bit parallel signal is supplied.